/*
 * (c) Copyright 2005, 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package com.hp.hpl.jena.sparql.util;

import com.hp.hpl.jena.query.ARQ;


public class RefBoolean
{
	private volatile boolean value ;
    public final boolean getValue() { return value; }

    public RefBoolean(Symbol monitoredProperty)
    { this(ARQ.getContext(), monitoredProperty, ARQ.getContext().isTrue(monitoredProperty)) ; }
    
    public RefBoolean(Symbol monitoredProperty, boolean initialValue)
    { this(ARQ.getContext(), monitoredProperty, initialValue) ; }
    
    public RefBoolean(final Context context, final Symbol monitoredProperty, boolean initialValue)
    {
        value = initialValue ;
        context.addCallback(
            new Callback()
            {
                public synchronized void event(Symbol property)
                {
                    if ( property.equals(monitoredProperty) )
                        value = context.isTrue(monitoredProperty) ;
                }
            }) ;
    }
    
    public RefBoolean(Context context, Symbol monitoredProperty)
    {
        this(context, monitoredProperty, context.isTrue(monitoredProperty)) ;
    }
}


/*
 * (c) Copyright 2005, 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */